Quantum-dot ligand, quantum-dot catalyst and quantum-dot device

Abstract

The present disclosure provides a quantum-dot ligand, a quantum-dot catalyst and a quantum-dot device. The quantum-dot ligand includes: a first ligand having a first group and a second group and a second ligand having an inorganic ion, in which a coordination bond is formed between the first group and a surface of a quantum dot, a hydrogen bond is formed between the second group and a hydroxyl group; and a coordination bond is formed between the inorganic ion and the surface of the quantum dot. The quantum-dot catalyst of the present disclosure can enhance a catalytic activity of the quantum dots and improve the catalytic performance.

1 . A quantum-dot ligand, comprising:
 a first ligand having a first group and a second group, wherein a coordination bond is formed between the first group and a surface of a quantum dot, and a hydrogen bond is formed between the second group and a hydroxyl group; and   a second ligand having an inorganic ion, wherein a coordination bond is formed between the inorganic ion and the surface of the quantum dot.   
     
     
         2 . The quantum-dot ligand of  claim 1 , wherein the first ligand has a general formula of R 1 —R 2 —R 3 , wherein R 1  has the first group, R 3  has the second group, and R 2  has at least one selected from a carbazole-based structure, a triphenylamine-based structure, or a fluorene-based structure. 
     
     
         3 . The quantum-dot ligand of  claim 2 , wherein R 1  has a chemical formula of (CH 2 ) n R 4 , 4≤n≤8, n is an integer, R 4  is the first group; and
 wherein R 3  has a chemical formula of (CH 2 ) n R 5 , 4≤n≤8, n is an integer, and R 5  is the second group. 
 
     
     
         4 . The quantum-dot ligand of  claim 2 , wherein R 1  is a linear chain, one end of R 1  is connected to R 2 , and the first group is located at the other end of R 1 . 
     
     
         5 . The quantum-dot ligand of  claim 2 , wherein R 3  is a linear chain, one end of R 3  is connected to R 2 , and the second group is located at the other end of R 3 . 
     
     
         6 . The quantum-dot ligand of  claim 2 , wherein R 2  is: 
       
         
           
           
               
               
           
         
       
     
     
         7 . The quantum-dot ligand of  claim 1 , wherein the first group is at least one selected from thiol group, amino group or carboxyl group. 
     
     
         8 . The quantum-dot ligand of  claim 1 , wherein the second group is at least one selected from amino group, hydroxyl group, carboxyl group, aldehyde group, carbonyl group or ether bond. 
     
     
         9 . The quantum-dot ligand of  claim 1 , wherein the inorganic ion is at least one selected from O 2− , S 2− , Se 2− , SCN  −  or halide ion. 
     
     
         10 . The quantum-dot ligand of  claim 1 , wherein the first ligand is: 
       
         
           
           
               
               
           
         
       
       wherein R 4  is independently —SH, —NH 2  or —COOH, and R 5  is independently —OH, —NH 2 , —COOH, —CHO, —CO— or —O—. 
     
     
         11 . A quantum-dot catalyst, comprising:
 a quantum dot; and   the quantum-dot ligand of  claims 1 ,   wherein a coordination bond is formed between the first group in the first ligand and a surface of the quantum dot, and a coordination bond is formed between the inorganic ion and the surface of the quantum dot.   
     
     
         12 . A quantum-dot device, comprising the quantum-dot catalyst of  claim 11 . 
     
     
         13 . The quantum-dot device of  claim 12 , wherein the quantum-dot device further comprises a positive electrode and a negative electrode, and the quantum-dot catalyst is located between the positive electrode and the negative electrode and is arranged as a layer. 
     
     
         14 . The quantum-dot device of  claim 13 , wherein surfaces of the positive electrode and the negative electrode have hydroxyl groups, and hydrogen bonds are formed between the second group in the quantum-dot catalyst and the hydroxyl groups on the surfaces of the positive electrode and the negative electrode, respectively. 
     
     
         15 . The quantum-dot device of  claim 13 , wherein the quantum-dot catalyst is arranged as a single layer of quantum dots or a multilayer of quantum dots. 
     
     
         16 . The quantum-dot catalyst of  claim 11 , wherein the first ligand has a general formula of R 1 —R 2 —R 3 , wherein R 1  has the first group, R 3  has the second group, and R 2  has at least one selected from a carbazole-based structure, a triphenylamine-based structure, or a fluorene-based structure. 
     
     
         17 . The quantum-dot catalyst of  claim 16 , wherein R 1  has a chemical formula of (CH 2 ) n R 4 , 4≤n≤8, n is an integer, R 4  is the first group; and
 wherein R 3  has a chemical formula of (CH 2 ) n R 5 , 4≤n≤8, n is an integer, and R 5  is the second group. 
 
     
     
         18 . The quantum-dot catalyst of  claim 16 , wherein R 1  is a linear chain, one end of R 1  is connected to R 2 , and the first group is located at the other end of R 1 . 
     
     
         19 . The quantum-dot catalyst of  claim 16 , wherein R 3  is a linear chain, one end of R 3  is connected to R 2 , and the second group is located at the other end of R 3 . 
     
     
         20 . The quantum-dot catalyst of  claim 16 , wherein R 2  is: